Cloudy ammonia: a multi-wavelength molecular line survey of the molecular clouds surrounding the W28 supernova remnant.
Date
2011
Authors
Nicholas, Brent
Editors
Advisors
Rowell, Gavin Peter
Clay, Roger William
Clay, Roger William
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Thesis
Citation
Statement of Responsibility
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Abstract
This thesis is a multi-wavelength study of high energy objects interacting with the interstellar medium (ISM). One such object is the W28 supernova remnant (SNR) with several sites of TeV (10¹ ² eV) γ-ray emission detected from its boundary by the H.E.S.S. telescopes. The γ-ray emission is spatially well matched to giant molecular clouds which surround the remnant. Inorder to understand the distribution of dense (n > 10³ cm⁻³) molecular gas in the region, multi-wavelength (λ ∼12mm and 7mm) molecular line surveys are presented. Utilising the NH₃, CS and SiO molecules, the broad-scale distribution of the dense and disrupted gas in the W28 region is revealed. Additional multi-wavelength data towards W28, including radio (λ ∼ cm), molecular line (λ ∼ mm), infra-red (λ ∼ 10⁻⁶m), X-ray (λ ∼ 10⁻¹⁰m) and γ-ray (λ ∼ 10⁻¹ ²m) data are compared and discussed in context with the results of this work. Other high energy ISM interacting objects, microquasars, are also studied. TeV γ-ray observations towards three candidate microquasars with jets and/or jet/ISM interactions are presented. In all three cases, no significant point-like or extended TeV γ-ray emission is seen and upper-limits are set.
School/Discipline
School of Chemistry and Physics
Dissertation Note
Thesis (Ph.D.) -- University of Adelaide, School of Chemistry and Physics, 2011
Provenance
Copyright material removed from digital thesis. See print copy in University of Adelaide Library for full text.